How to install ISPConfig?

I installed Ubuntu 8.04 LTS server all night yesterday according to the tutorial-The Perfect Server - Ubuntu Hardy Heron (Ubuntu 8.04 LTS Server).
I almost get sucessful until installing ISPConfig.
During the tutorial the author talked about using ispconfig but at the end he did not explain how to isntall it. I looked at the install manual on ispconfig's site but it is far from clear, especially since this is my first time running a linux server and my first time running only in command line. I would really appreciate a tutorial on how to install ispconfig. I would suspect that it would be short but possibly include how to download it, either from another computer or through the command line, and how to call the install commands.
Thanks!